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By Ingalis A.G. (ed.)

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54 COI{TBOLIIIIGTHE OUTPUTAND FEADIIIIGTHE INPUT Dntl ENE NE EN EN i1 EE EE NE EE EE EE NE NE EE NE o schemalicd agram lrlFiiiiiia:d:3lrl TheLcDdisplay wiring. 4]l Displavins andblinking"HELLOWORLD" For the LCD displal rcgistcN oD the LAB XL CLE]AR DEFIIIE DEFINE DEFINE DEFITIE DEFINE DEFTNE DEFINE clear OSC 4 LCD DREG PORTD IJCD RSREG PORTE I,CD RSBIT O IJCD EREG PORTE ItrCD EBIT 1 LCD RWREG PORTE I ; ; select , ; enable ; ; rc asfollows: theDEFINEstatemenls Lhe nenory register These registe! CD COMMANDI'S 2 0 0 0 ; delay I,CD_DATAUS 50 delay Set Lhe port directions.

CLEAR Zerc all variables. 3A flIE SOFTWANE. IE COIIIPILEFS,AI{D IHE ED|ION CLEARWDT Clear (tickle) watchdog timer. COUNT Count number of pulseson a pin. DATA Define initial contentsof on-chip EEPROM. DEBUG Asynchronousseflal output to fixed pin and baud. DEBUGIN Asynchronousserial input from fixed pin and baud. DISABLE DisableON DEBUG andON INTERRLIPTFocessing. DISABLEDEBUG DisableON DEBUG processilg. DISABLE INTERRUPI Disable ON INTERRUPI Focessing. DTMFOI-IT Producetouch{ones on a pin. EEPROM Define initial contentsof on-chip EEPROM.

Thesebits multiply the time between inteffupts often by powers of two. Prcscalarsand postscalarshave the sameeffect on the interrupts: They delay them. COUNTERS OnlyTimer0andTimerlcanbeusedascounters. Timer2cannotbeusedasa counter becauseit doesnot have an extemal input line. Both the timers andthe countersar€coveredin detail in Chapter 6. THE SOFTWARE,THE COMPILERS, AND THE EDITOR MicroEngircering Labs, Inc. , compilers and selectthe one best suitedto both your budget and yout needs. ENDASM Insert assemblylanguagecode section.

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